Inverter Neutral Point Charging for Electric Vehicles
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Solution Overview
Problem
Electric vehicles with high-voltage batteries cannot be easily charged by simple connection with another vehicle due to voltage differences, leading to customer inconvenience and increased costs for separate charging equipment.
Innovation Solution
A charging power supplying system using a motor driving system with an inverter, switching devices, and a controller that converts battery power to output current at a neutral point, allowing for efficient charging of external vehicles by controlling the switching devices to follow preset current commands and compensating for nonlinearity and current imbalances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate high-voltage battery and high-voltage converter are used for mobile charging equipment, then charging capability is provided, but device complexity and cost increase
Solution Approach 1:
The motor driving system is designed to perform both its original function of driving the motor and an additional function of providing mobile charging capability. The inverter and battery that are already present for motor operation are reused for charging another vehicle, making the system multi-functional and eliminating the need for separate charging equipment.
Solution Approach 2:
The charging function is merged with the motor driving system by connecting the charging power output terminal to the neutral point of the motor. This combines the motor control functions and charging functions into a single integrated system, reducing overall complexity and component count.
2Adaptability or versatility
If a separate cable for vehicle-to-vehicle battery charging is used, then charging is enabled, but cost increases
Solution Approach 1:
The motor driving system is designed to perform both its original function of driving the motor and an additional function of providing mobile charging capability. The inverter and battery that are already present for motor operation are reused for charging another vehicle, making the system multi-functional and eliminating the need for separate charging equipment.
3Ease of operation
If simple connection with another vehicle is used, then charging is simplified, but voltage compatibility is not achieved
Solution Approach 1:
The inverter acts as an intermediary device between the battery and the external vehicle. It converts the battery power to appropriate voltage levels and controls the power flow, ensuring voltage compatibility while maintaining simple connection operation. The controller manages the switching devices to achieve the desired current output at the charging power output terminal.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables stable and efficient power transfer to external vehicles, reducing the need for separate charging infrastructure and alleviating customer concerns about electric vehicle purchases by providing a cost-effective solution for vehicle-to-vehicle charging.
Implementation Method 1
an inverter that is connected to a battery, includes at least one switching device, and is configured to change an on/off state of the switching device and to convert power stored in the battery
Implementation Method 2
a motor including a plurality of coils that each receive power provided from the output terminal of the inverter
Data Source
AI summary
A charging power supplying system using a motor driving system includes an inverter that is connected to a battery, includes at least one switching device, and is configured to change an on/off state of the switching device and to convert power stored in the battery to output the converted power to an output terminal of the inverter, a motor including a plurality of coils that each receive power provided from the output terminal of the inverter, a charging power output terminal that is connected to a neutral point to which the plurality of coils of the motor is commonly connected and outputs current output from the neutral point to an external charging target, and a controller configured to control the switching device in the inverter based on current of the output terminal of the inverter.